Petroleum Science and Engineering 2017; 1(1): 17-22 http://www.sciencepublishinggroup.com/j/pse doi: 10.11648/j.pse.20170101.14 Study of Adsorption Isotherm and Kinetics of Reactive Yellow Dye on Modified Wheat Straw Khalid M. Mousa * , Alaa H. Taha Department of Chemical Engineering, Al-Nahrain University, Baghdad, Iraq Email address: * Corresponding author To cite this article: Khalid M. Mousa, Alaa H. Taha. Study of Adsorption Isotherm and Kinetics of Reactive Yellow Dye on Modified Wheat Straw. Petroleum Science and Engineering. Vol. 1, No. 1, 2017, pp. 17-22. doi: 10.11648/j.pse.20170101.14 Received: January 29, 2017; Accepted: February 14, 2017; Published: March 2, 2017 Abstract: In this study, the adsorption of reactive yellow dye which is one of the most commonly used soluble dyes in textile industries was studied using modified wheat straw, the surface of raw wheat straw was modified with a cationic surfactant CTAB. to understand the adsorption behavior of the reactive yellow, dye the adsorption kinetics and the adsorption isotherm studies have been investigated. Batch experiments was carried out with an initial concentration of 10 mg/L with 0.5 gm of adsorbent to study the contact time of equilibrium and then the adsorption mechanism process using three kinetic models; Pseudo-first, second order and intra-particle model. Isotherm studies was carried out at three different adsorbent amounts (0.1, 0.2, 0.4, 0.6, 0.8 and 1.0) gm to predict the type of adsorption process on the surface (chemical or physical) using three isotherm models; Langmuir, Freundlich and BET models. The results showed that the pseudo-second order is best fitted, intra-particle diffusion kinetic model fitted well to experimental data and is not the only controlling step of adsorption rate, and the adsorption isotherm follows both Langmuir and Freundlich models referring to the chemical adsorption. Keywords: Kinetics, Isotherm, Modified Wheat Straw 1. Introduction The production of textiles represents one of the big consumers of high water quality. As a result of various processes, considerable amounts of polluted water are released. Representative magnitudes for water consumption are 100– 200 L of water per kilogram of textile product. Considering an annual production of 40 million tons of textile fibers, the release of wasted water can be estimated to exceed 4–8 billion cubic meters per year [1]. Textile wastewater usually consists many of contaminants, including acids, bases, dissolved solids, toxic compounds and color. Color is the most noticeable contaminant even at low concentrations, and it needs to be removed or decolorized before the discharging the wastewater [2]. Colors are easily visible to human eyes even at very low concentrations. Hence, color from textile wastes carries significant aesthetic importance. Most of the dyes are stable and include no effect of light or oxidizing agents [3]. Reactive dyes are widely used in the textile industry which link to fibers through chemical combining by react with OH group in fiber [4]. Adsorption has been found to be superior to other techniques for water re-use in terms of initial cost, simplicity of design, ease of operation and insensitivity to toxic substances. At the present time, there is a growing interest in using low-cost, commercially available materials for the adsorption of dyes [5] 2. Mathematical Models 2.1. Adsorption Kinetics Models Various adsorption kinetic models have been adopted to describe the behavior of batch biosorption processes under different experimental conditions, among which we have the intra-particle diffusion model. Kinetics of adsorption is one of the important characteristics defining the efficiency of adsorption, the study of adsorption dynamics describes the solute uptake rate and evidently the rate control the resident time of adsorbate uptake at the solid-solution interface. The adsorption rate constant can be used to compare the performance of activated carbons [6]
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Petroleum Science and Engineering 2017; 1(1): 17-22
http://www.sciencepublishinggroup.com/j/pse
doi: 10.11648/j.pse.20170101.14
Study of Adsorption Isotherm and Kinetics of Reactive Yellow Dye on Modified Wheat Straw
Khalid M. Mousa*, Alaa H. Taha
Department of Chemical Engineering, Al-Nahrain University, Baghdad, Iraq
Email address:
*Corresponding author
To cite this article: Khalid M. Mousa, Alaa H. Taha. Study of Adsorption Isotherm and Kinetics of Reactive Yellow Dye on Modified Wheat Straw. Petroleum
Science and Engineering. Vol. 1, No. 1, 2017, pp. 17-22. doi: 10.11648/j.pse.20170101.14
Received: January 29, 2017; Accepted: February 14, 2017; Published: March 2, 2017
Abstract: In this study, the adsorption of reactive yellow dye which is one of the most commonly used soluble dyes in
textile industries was studied using modified wheat straw, the surface of raw wheat straw was modified with a cationic
surfactant CTAB. to understand the adsorption behavior of the reactive yellow, dye the adsorption kinetics and the adsorption
isotherm studies have been investigated. Batch experiments was carried out with an initial concentration of 10 mg/L with 0.5
gm of adsorbent to study the contact time of equilibrium and then the adsorption mechanism process using three kinetic
models; Pseudo-first, second order and intra-particle model. Isotherm studies was carried out at three different adsorbent
amounts (0.1, 0.2, 0.4, 0.6, 0.8 and 1.0) gm to predict the type of adsorption process on the surface (chemical or physical)
using three isotherm models; Langmuir, Freundlich and BET models. The results showed that the pseudo-second order is best
fitted, intra-particle diffusion kinetic model fitted well to experimental data and is not the only controlling step of adsorption
rate, and the adsorption isotherm follows both Langmuir and Freundlich models referring to the chemical adsorption.
Figure 8. Freundlich isotherm model for reactive yellow using modified wheat straw.
22 Khalid M. Mousa and Alaa H. Taha: Study of Adsorption Isotherm and Kinetics of Reactive
Yellow Dye on Modified Wheat Straw
Figure 9. BET isotherm model for reactive yellow using modified wheat straw.
5. Conclusion
From the above studies it can be shown that modified
wheat straw is a good adsorbent for a soluble reactive yellow
dye and the adsorption process is a chemical adsorption on
the surface of the adsorbent and follows the Langmuir and
Freundlich isotherm models. The kinetics studies showed that
the data are best fitted with the pseudo-second order model
and well fitted with the intra-particle diffusion model and
there are two adsorption mechanism controlling the
adsorption process; the first on the surface and the second on
the pores of the adsorbent as shown in the intra-particle
diffusion model. Another isotherm models could be used to
study the possibility of mono or multi-layer adsorption such
as Elovich, Temkin and Anderson.
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